单选题The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）Aregulating the level of corrosion inhibitor in the primary cooling systemBthe level of the freshwater expansion tankCvarying the engine load to meet temperature requirementsDthe operation of the thermostatic valve
单选题
The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）
A
regulating the level of corrosion inhibitor in the primary cooling system
B
the level of the freshwater expansion tank
C
varying the engine load to meet temperature requirements
D
the operation of the thermostatic valve
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